Radio apparatus



Dec. 3, 1929. w. M. BROWER 1,737,824

RADIO APPARATUS Filed Dec. 5, 1926 2 Sheets-Sheet 1 IN V EN TOR.

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Dec. 3, 1929. w. M. BROWER 1,737,824

RADIO APPARATUS Filed D60. 3,, 1926 2 Sheets-Sheet 2 ATTORNEY Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE WILLIAM H. BROWER, OF PALO ALTO, CALIFORNIA, ASSIGNOR TO FEDERAL TELE- GRAPH COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALI- FOBNIA RADio APPARATUS Application filed December 3, 1926. Serial No. 152,495.

My invention relates broadly to a signal receiving apparatus and more particularly to a construction of electrostatic shield and apparatus support for high frequency signal receiving apparatus.

One of the objects of my invention is to provide a construction of casing for radio receiving apparatus arranged for the me chanical protection and the electrostatic shielding of the signal receiving apparatus.

Another object of my invention is to provide a casing for radio receiving apparatus in which a part thereof may be readily removed for permitting access to the signal receiving apparatus wit in the casing at the same time that mechanical protection is afforded against injury to the equipment.

Another object of my invention is to provide a construction of radio receiving appa ratus in which a metallic casing is arranged to entirely enclose the signal apparatus, with a sectional portion of the casing adapted to be removed and replaced from the main casing for gaining access to the apparatus, with means for rigidly securing the removable section with respect to the main casing when the removable section .is in position.

Another object of my invention is to provide a construction of casing for radio receiving apparatus in which the parts of the apparatus may be resiliently suspended from the interior of the casing and protected against injury while ready access may be had at all times to the equipment by the removal of a section of the casing, the apparatus being electrostatically shielded by the casing which provides an enclosure for the equipment.

Other and further objects of my invention reside in the construction of the suspension means having an apparatus shelf within the casing for reenforcing the metallic walls of the casing and the arrangement of resilient means for preventin shock vibration of the removable section 0 the casing, as will be more fully understood from the specification hereinafter following and the accompanying drawings in which:

Figure 1 is a rear view of the apparatus 'casing of my invention; Fig. 2 is a sectional 2-2 of Figs. 1 and 3; Fig. 3 is a fragmentary cross-sectlonal view taken through the casing and showing the removable section thereof in raised position with respect to the main casmg; Flg. 4 1s a cross-sectional view taken through the casing on line 44'of Fig. 5 illustrating the arrangement of mounting for the apparatus shelf within the casing; Fig. 5 is a cross-sectional view taken on line 5-5 of Fig. 4 and illustrating the interior arrangement of the parts of the casing; Figs. 6 and 7 are perspective views of the parts of the brackets employed to support the apparatus shelf within the chassis of the receiver.

My invention contemplates a metallic chassis for radio receiving apparatus from WhICl'l all parts may be mounted and mechanically protected while being electrostatically shielded. The electron tubes and other sensitive parts of the equipment may be resilientlv suspended from the interior walls of the chassis.

In order to prevent free vibration of the metallic side walls of the chassis and the setting up of microphonic noises, the side walls are tensioned by outstruck portions at vari ous parts throughout the area of the walls. The casing is cut away at an angle adjacent one side and a removable corner section inserted over the cut away portion with spring means for preventing rattling of the removable section and thereby eliminating the tendency of the acoustic disturbances in the receiver.

Referring to the drawings in detail, reference character 1 designates the main portion of the chassis. Reference character 2 designates the removable section of the chassis by which access is had to the apparatus interior of the chassis. The chassis is cut away at one side on an angle as represented at 3. Removable section 2 has angularly disposed edges 8 which are offset with respect to the plane of the side walls of the removable section 2. The chassis 1 has its upper edge 4 slightly canted to receive the edge portion 6 of the removable section 2. The edge portion 6 is offset with respect to the plane of the top surface of the removable section 2 so that the upper surface of the chassis and the removable section are in the'same plane. In order to secure the edge 6 in position against rattling I provide spring members 4 secured to the inner side of the top surfaces of the chassis 1 and extending in such manner as to grip the under surface of the ofiset edge 6 and force the same against the under surface of the edge 4 of the chassis. The lower edge 20 of removable section 2 fits into the offset edge 5 of the chassis 1 so that the side wall of the chassis is substantially a continuous plane. Spring members 5 are provided which bear against the innersurface of the wall of removable section 2 preventing rattling of the removable section with respect to the main chassis 1. The opposite edges 8 of the removable section ,2 are secured in position by spring members 3 which bear against the inner surface of edges 8 forcing these edges against the angularly disposed edges 3 of the chassis 1. In order to provide a support for the apparatus within the chassis bracket members 9 and 10 are secured to the inner surfaces of the walls of the chassis 1. The bracket members are indicated more clearly in the perspective view in Figs. 6 and 7.

The bracket 9 is shown as having laterally extending tongues 9 and 9". The bracket members are each similar in construction and serve to locate a resilient rubber member 12 against one side of the chassis. The rubber member 12 is slotted as represented at 11 for receiving opposite ends of the tube shelf 14. All apparatus subject to the generation of microphonic noises under conditions of vibration may be suspended from shelf 14 and protected accordingly. The side walls of the chassis are prevented from acting as large, free diaphragms which would normally tend to vibrate in their natural periods by means of the offset portions 15, 16 and 17 distributed throughout the area of the side walls for mechanically tensioning the walls. The base of the chassis may be suitably strengthened or insulated by means of extended strips 18 and 19. The purpose of the spring members 3, 4*, and 5* is to exert a continuous force against the inner walls of the removable sec tion 2 for forcing this section into intimate contact with the side walls of the main chassis 1, preventing the removable section from rattling and eliminating microphonic noises in the receiver.

Connections to the apparatus within the chassis may be brought out through flexible leads and the complete chassis mounted within a cabinet structure. Apertures may be provided in the front wall of the chassis through which the controls project.

The chassis construction of m invention has been found to be very practical in construction. The arrangement of parts lends itself particularly to processes of manufacture on a quantity production basis.

While I have described my invention in one of its preferred embodiments, I desire it to be understood that modifications may be made and that no limitations are intended upon my invention other than are imposed by the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is as follows:

1. A chassis for signaling apparatus comprising a metallic casing forming an enclosure for radio apparatus said casing being angularly cut away adjacent one side thereof, a removable corner section independent of said casing arranged to be inserted on said casing, the edges of said removable corner conforming with the angular disposition of said asing and overlapping with the edges of said chassis, and means for urging the edges of said removable corner section in engagement with the edges of said chassis.-

2. A chassis for signaling apparatus comprising a metallic casing angularly cut away at one side thereof, a corner section having side portions lying in planes contiguous with the planes of the side walls of said chassis, offset edge portions on said corner section adapted to overlap with the edge portions of said chassis, and spring means carried by the interior walls of said chassis adjacent the angularly cut away side thereof for bearing against the edges of said corner section and forcing said edges into engagement with the edges of said chassis.

3. A chassis for signaling apparatus comprising a metallic casing cut away at an angle adjacent one side thereof, a corner section having side walls arranged to normally extend in planes contiguous with the side walls of said chassis, edge portions on said corner section each arranged to cooperate with edge portions on said chassis, and a plurality of independent spring means at opposite ends of said casing for forcing said edge portions into mutual engagement and preventing independent movement of said corner section with respect to said chassis.

41. A chassis for signaling apparatus comprising a main enclosing casing angularly cut away adjacent one side thereof, a separable corner section having its walls normally eonforming with the plane of the walls of said main enclosing casing, edge portions on said corner section arranged to overlap with edge portions on said main chassis and a plurality of spring members mounted at spaced intervals along the edges of the walls of said main chassis for engaging the edges of said corner section and securing said corner section in position. 1

5. In a signaling apparatus a metallic enclosing casing a pair of brackets mounted ad jacent each other on the opposite interior walls of said metallic casing, each of said brackets having tongues extending therefromand directed toward each other, a resilient supporting member located between said brackets and fixed in position by said tongues, an apparatus shelf extending between the resilient supporting members carried by said opposite walls, said casing being angularly cut away adjacent said shelf and a separable corner section engageable over said casing above said shelf.

6. In a signal receiving apparatus a metallic enclosing casing, a pair of bracket members secured to the interior opposite Walls of said metallic casing each of said bracket members including tongues directed toward each other, a resilient supporting member, said tongues operating to rip said resilient supporting member there etween, and an apparatus shelf centrally positioned in each of said resilient supporting members and extending between the oppos1te walls of said metallic casing, said casing being angularly cut away adjacent said shelf, and a separable corner section insertable over the cut away portion of said casing above said shelf.

In testimony whereof I aflix my signature.

WILLIAM M. BROWER. 

